ADORABLE: Behind the scenes photos of sleepy Heirs cast

The Heirs production company, Hwa & Dam Pictures, recently posted behind the scenes (BTS) photos of its cast members in various positions of sleep. A representative commented that many of the actors film with only 2-3 hours of sleep daily, and use any time in between shots to nap. Despite the late nights and freezing weather, it was revealed that the actors still push on with a fighting spirit, and always try their best.

Among the pictures is one of Park Shin Hye holding up her own adorably candid shot of Hyungsik asleep.